456 / 2018-12-29 17:02:48

圆柱-翼型干涉流场及噪声数值模拟研究

圆柱-翼型干涉；流场；气动噪声；CFD

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圆柱-翼型干涉流场及噪声数值模拟研究
李忠贺，张野，于茜，王晓放*
大连理工大学能源与动力学院，辽宁 大连 116024
摘 要：本文采用计算流体力学软件FLUENT对自由来流为U=72m/s, 翼弦雷诺数Re=4.8×10^5条件下的经典圆柱-翼型干涉流场的噪声算例进行噪声模拟。文中详细研究了不同精度的湍流求解方法URANS、DDES以及LES对流场中速度分布以及非定常速度脉动的预测准确性，讨论了计算模型的展向距离对计算结果的影响。进一步采用Ffowcs Williams and Hawkings （FW-H）模型对流场中不同位置的声压级进行预测，通过与实验数据的详细对比，验证并且评估FLUENT中气动噪声模型的精度。本文研究结果有助于采用数值方法提高气动噪声的预测结果，对于下一步预测其他复杂结构产生的气动噪声问题具有指导意义。
关键词：圆柱-翼型干涉；流场；气动噪声；CFD
Numerical simulation of flow field and noise of rod-airfoil
LI Zhonghe，ZHANG Ye，YU Xi，WANG Xiaofang*
School of Energy and Power Engineer, Dalian University of Technology，Dalian 116024, China
Abstract: In this paper, the computational fluid dynamics software FLUENT is used to predict the aeroacoustic field of the classical rod-airfoil test case flow with the condition of inflow velocity U=72m/s and airfoil-chord based Reynolds number Re=4.8×10^5. The prediction accuracy of the velocity distribution and unsteady velocity fluctuations in the turbulent flow field by using different approaches, including URANS, DDES and LES, are detailed investigated. The effects of span size on the numerical results are discussed. The Ffowcs Williams and Hawkings (FW-H) acoustic model is further used to predict the sound pressure levels at different locations in the flow field. By detailed comparison with experimental data, the aeroacoustic model in FLUENT is validated and evaluated. The results of this paper are useful to improve the prediction accuracy of the aeroacoustic field by the numerical approach, which will be used in the prediction of aerodynamic noise caused by other more complicated structures in the next step.

Key words: rod-airfoil; flow field; aerodynamic noise; CFD